1. The Protagonist's Secret Sibling
- They're a ninja master who shows up to help with the plot at the last minute.
- Give them a last-minute superpower.
- Make them a mysterious ally.
2. The Unexpected Villain
- A rival author who tries to sabotage your work.
- Make them an over-the-top, mustache-sporting nemesis.
- Make them the protagonist of a terrible rip-off of your story.